Question

I have a text file that I am reading. It has chunks that I would want to remove. Is there a way I can say If the reader comes across a String “STATEMENT OF ACCOUNT” it skips reading the 10 lines before that Statement. This is the code I am currently using which is reading everything from the Text file.

  for(int i = 0; i < filenames.length; i++){
   FileInputStream fstemp = new FileInputStream("C:/Temporary/" + filenames[i]); 
   FileOutputStream fos = new FileOutputStream("C:/Statements/" + filenames[i]);  
   DataInputStream in1 = new DataInputStream(fstemp);
   UniqueLineReader brtemp = new UniqueLineReader(new InputStreamReader(in1));
   BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));
   String strLine;
   while((strLine = brtemp.readLine()) != null){
     bw.write(strLine);
     bw.newLine();
     bw.flush();

   }


    }

Answer 1

You can do it by buffering the preceding 10 lines in a queue:

Queue<String> queue = new LinkedList<String>();
String strLine;
while ((strLine = brtemp.readLine()) != null {
    queue.add(strLine);
    if (strLine.equals("STATEMENT OF ACCOUNT")) {
        queue.clear();
        continue;
    }

    while (queue.size() >= 10) {
        bw.write(queue.remove());
        bw.newLine();
    }
}
while (!queue.isEmpty()) {
    bw.write(queue.remove());
    bw.newLine();
}
bw.flush();